EP1342841B1 - Roll arrangement - Google Patents

Description

The invention relates to a roller assembly having at least one nip, which is formed between a particular selbstanstellenden Durchbiegungseinstellwalze and a backing roll, wherein the deflection set roll a rotating roll shell, a roll shell axially passing through rotatable yoke and disposed between the roll shell and the yoke, on the roll shell on legbare Support elements comprises and the nipseitigen supporting elements of the deflection adjustment are at least partially formed so that they can take a retracted position from the roll shell ability. A roller arrangement of this type is known from EP 0 328 502 A.

Deflection adjustment rollers, in particular self-adjusting deflection adjustment rollers are used, inter alia, in Mehrwalzenkalandern in which are currently used transmissions that bring due to the gear teeth vibration problems and also require a relatively large amount of space. Given today's speeds, which are significantly higher than in the past, the aforementioned vibration problems occur to a greater extent. The gear also results in a higher roll weight, which must be compensated by external support sources. External support sources but now as well as, for example, due to the transmission higher space requirements an increase in Lagerabstandmaßes with it. Finally, the gearboxes are relatively expensive.

The aim of the invention is to provide an improved roller assembly of the type mentioned, with which the aforementioned problems are eliminated.

This object is achieved in accordance with the invention in that the roller arrangement comprises a Stener and / or regulating device by means of which the nip-side support elements of the deflection adjustment roller can be controlled such that at least some of them assume a position withdrawn from the roll shell during the starting operation of the deflection adjustment roller taking place with the nip open ,

After at least part of the nipseitigen support elements has been withdrawn from the roll shell during the start-up operation in which the deflection adjustment roll has to be correspondingly accelerated, i. is no longer in operative engagement with this, the drive power required when starting the deflection adjustment roller is reduced accordingly, so that the relevant drive power, for example. can also be applied by a vibration damping auxiliary drive, which must be designed only for a correspondingly lower power. Thus, as a result of the retracted support elements, among other things, the friction and planing performance is significantly reduced. The retracted support elements are for the circulating oil layer practically no significant obstacle more. So it can in particular no longer beat oil against the support elements, whereby the roll shell has been greatly slowed down. After a successful closing of the nip, the additionally required power can be applied in particular via the counter-roller. It must therefore not be applied in all cases, the whole performance of the said auxiliary drive.

Preferably, therefore, at least the deflection adjustment roller is associated with a vibration damping auxiliary drive. This may merely be, for example, a belt drive. In principle, however, other vibration damping drives can be used.

During the starting operation, the largest part of the nip-side support elements advantageously assumes a position withdrawn from the roll shell.

In a preferred practical embodiment of the roller assembly according to the invention assume all nipseitigen supporting elements each one retracted from the roll shell position during startup, whereby the drive power required during startup is reduced to a minimum.

The nipseitigen support elements withdrawn from the roll shell during the starting operation are expediently able to be applied to the roll shell upon reaching the operating speed and / or during the grinding of the nip.

In a preferred practical embodiment of the roller assembly according to the invention, the relevant nipseitige support elements are resiliently loaded in its retracted position. Preferably, the respective nipseitigen supporting elements are each loaded by a conical spring in its retracted position. The conical spring in the loaded state expediently takes the form of an at least substantially flat spiral in order to achieve the highest possible compression and to withdraw the relevant support element as far as possible from the mantle.

In an expedient practical embodiment of the invention, the respective nipseitiges support member in the retracted position loading spring is disposed within the support member and preferably supported on a stop which at one end of a in the Support member extending bolt or the like is arranged, which is fixed with its other end to the yoke.

It is particularly advantageous if the oil temperature is controlled so that it is higher during the start-up than after.

According to a further advantageous embodiment, the volume flow of the oil is variable depending on whether the deflection adjusting roller is in the starting operation or not.

The nipseitigen supporting elements can be applied in particular by applying pressure to the roll shell. It may therefore be in particular hydraulic support elements. The support elements can be hydrodynamically and / or hydrostatically lubricated.

During start-up operation, at least the support elements occupying their retracted position are expediently depressurized.

The roller arrangement may in particular be designed as a multi-roll calender. The invention is thus applicable in particular to such a multi-roll calender.

Figur 1

eine schematische, teilweise geschnittene Darstellung einer Walzenanordnung mit einem zwischen einer selbstanstellenden Durchbiegungseinstellwalze und einer Gegenwalze gebildeten Nip, wobei sich die Durchbiegungseinstellwalze in dem bei offenem Nip stattfindenden Anfahrbetrieb befindet,

Figur 2

die Walzenanordnung gemäß Figur 1 bei geschlossenem Nip und

Figur 3

in der rechten Hälfte eine vergrößerte Darstellung eines Teilbereichs "A" der Durchbiegungseinstellwalze gemäß Figur 1 und in der linken Hälfte eine vergrößerte Darstellung eines entsprechenden Teilbereichs "B" der Durchbiegungseinstellwalze gemäß Figur 2 mit einem seine zurückgezogene Position einnehmenden Stützelement bzw. mit einem an den Walzenmantel angelegten Stützelement.

The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:

FIG. 1

a schematic, partially sectioned view of a roller assembly with a formed between a Selbstanstellenden deflection and an opposing roll nip, wherein the deflection is in the rolling nip takes place starting operation,

FIG. 2

the roller assembly of Figure 1 with the nip and

FIG. 3

in the right half an enlarged view of a portion "A" of the deflection roll according to Figure 1 and in the left half an enlarged view of a corresponding portion "B" of the deflection roll according to Figure 2 with its retracted position engaging support element or with a voltage applied to the roll shell support element.

Figures 1 to 3 show in a purely schematic representation of an exemplary embodiment of a roller assembly 10 with a nip or nip 12, which is formed between a selbstanstellenden deflection adjustment roller 14 and a counter-roller 16.

The self-adjusting deflection adjustment roller 14 comprises a circumferential roller shell 18, a non-rotatable yoke 20 passing axially through the roller shell 18, nip-side support elements 22 arranged between the roller shell 18 and the yoke 20 and counter elements 24 provided on the other side of the yoke 20.

As can be seen with reference to Figures 1 and 2, the deflection roll 14 is actuated via a vibration damping auxiliary drive, in the present case e.g. a belt drive 26 driven, which may for example comprise a toothed belt 26 ', which cooperates with a provided on the roll shell 18 sprocket 48.

The nipseitigen supporting elements 22 of the deflection adjustment roller 14 are controlled in particular via a corresponding control and / or regulating device that at least a part thereof during the taking place with nip 12 starting operation of the deflection adjustment, in which this is accelerated accordingly, a withdrawn from the roll shell 18 position takes (see Figure 1 and the reproduced enlarged in the right half of Figure 3 subarea "A"). In the present case, all nipseitigen supporting elements 22 each take a retracted from the roll shell 18 position during startup.

The counter-elements 24 rest on the roll shell 18. By these counter-elements 24 of the roll shell 18 was moved relative to the yoke 20 for opening the nip 12 of the backing roll 16. In the present case, the upper deflection roll 14 is lifted by these counter elements 24 for opening the nip 12 and supported in the illustrated upper position at a distance from the counter roll 16.

The nipseitigen support elements 22 retracted by the roll shell 18 during the starting operation are applied to the roll shell 18 when the operating speed and / or closing of the nip 12 is reached. For this purpose, the nipseitigen supporting elements 22 are applied accordingly with pressure. As can be seen in particular with reference to FIG. 3, hydrostatic support elements 22 are provided in the present case. They can be hydrodynamically and / or hydrostatically lubricated.

It can also be seen from FIG. 3 that the nip-side support elements 22 are each resiliently loaded in their retracted position. For this purpose, these support elements 22 may in particular be acted upon in each case by a conical spring. As can be seen from the representation in the left half of FIG. 3, the conical spring 30 in the loaded state has the form of an at least substantially flat spiral in order to achieve the highest possible compression and thus the respective support element 22 as far as possible from the roll shell 18 withdraw.

In the present case, the spring 30 is disposed within the respective support member 22 and z. B. supported on a stop 32 which is arranged at one end of a extending into the support member 22 bolt 34 or the like, with its other end on the yoke 20th is fixed (see Figure 3). The conical spring 30 is pushed onto the bolt 34 and is supported with its narrow or pointed end on the stop 32. With its opposite broader end, the conical spring 30 is supported, for example, at the bottom of the support element 22.

According to Figure 3, the piston-like support member 22 is in the retracted position largely within a cylinder chamber 36 formed in the yoke 20. With a corresponding pressurization, the piston-like support member 22 is extended against the spring force against the spring force on the inside of the roll shell 18. The corresponding pressurization takes place via an opening into the cylinder chamber 36 line 38. If the support member 22 is again depressurized, it is moved by the conical spring 30 back into the retracted position shown in the right half of Figure 3.

The nipseitigen support members 22 are thus applied in the present case by appropriate pressurization against the force of the respective spring 30 to the roll shell 18, while they are depressurized in the starting operation and are held in accordance with the springs 30 in its retracted position.

A corresponding roller arrangement can be provided in particular in a multi-roll calender.

In FIG. 1, the deflection adjustment roller 14 is located in the starting mode which takes place when the nip 12 is open, in which it is accelerated accordingly. The nipseitigen supporting elements 22 each take their retracted position (see also the right part of Figure 3). The support members 22 are thus depressurized and held by the conical springs 30 in the retracted position accordingly. Especially upon reaching the operating speed and / or closing of the nip 12, the support elements 22 are pressurized and against the force of the springs 30 applied to the inside of the roll shell 18 (see Figure 2 and the left half of Figure 3). As can be seen with reference to FIG. 2, the counter-elements 24 are retracted from the roll shell 18 during the start-up operation

In addition, it is also conceivable to control or regulate the oil temperature so that it is higher during the starting operation than afterwards. It is also conceivable, for example, to change the volume flow of the oil as a function of whether the deflection adjustment roller 14 is in start-up mode or not.

The following example shows a possible reduction in the drive power required when starting the deflection adjustment roller 14:

For example, in a deflection set roll having a diameter of, for example, 1100 mm, a length of e.g. 10 m, for example, 48 support elements with a diameter of 150 mm and at a speed of, for example, 1800 m / min, a drive power of, for example, about 850 kW is required.

With a retraction of the nipseitigen support elements eliminates an applied friction between the support elements and the roll shell of about 240 kW. In addition, the planing performance (against the support elements beating circulating oil in the roller) is reduced by, for example, about 20% from 580 kW to eg 460 kW, so that a total of the bearing friction remains below 500 kW.

LIST OF REFERENCE NUMBERS

10

roll arrangement

12

Nip, nip

14

deflection

16

backing roll

18

roll shell

20

yoke

22

nipseitiges support element

24

counter-element

26

Anti-vibration auxiliary drive, belt drive

26 '

toothed belt

28

sprocket

30

conical spring

32

attack

34

bolt

36

cylinder space

38

management

Claims (16)

1. A roll arrangement (10) comprising at least one nip (12) which is formed between a deflection controlled roll (14), in particular a self-adjusting deflection controlled roll, and a counter roll (16), wherein the deflection controlled roll (14) includes a peripheral roll jacket (18), a rotationally fixed carrier (20) axially passing through the roll jacket (18) as well as support elements (22) which are arranged between the roll jacket (18) and the carrier (20) and can be brought into contact with the roll jacket (18), and wherein at least some of the support elements (22) at the nip side of the deflection controlled roll (14) are made such that they can adopt a position retracted from the roll jacket (18),
   characterized in that it includes a control and/or regulation device via which the support elements (22) at the nip side of the deflection controlled roll (14) can be controlled such that at least some of them adopt a position retracted from the roll jacket (18) on a start-up operation taking place with an open nip (12).
2. A roll arrangement in accordance with claim 1, characterized in that a vibration damped auxiliary drive (26) is associated with at least the deflection controlled roll (14).
3. A roll arrangement in accordance with claim 2, characterized in that the vibration damped auxiliary drive includes a belt drive (26).
4. A roll arrangement in accordance with any one of the preceding claims, characterized in that the larger part of the support elements (22) at the nip side adopts a position retracted from the roll jacket (18) during start-up operation.
5. A roll arrangement in accordance with any one of the preceding claims, characterized in that all support elements (22) at the nip side each adopt a position retracted from the roll jacket (18) during start-up operation.
6. A roll arrangement in accordance with any one of the preceding claims, characterized in that the support elements (22) at the nip side which are retracted from the roll jacket (18) during start-up operation can be brought into contact with the roll jacket (18) on reaching the operating speed.
7. A roll arrangement in accordance with any one of the preceding claims, characterized in that the support elements (22) at the nip side which are retracted from the roll jacket (18) during start-up operation can be brought into contact with the roll jacket (18) on the closing of the nip (12).
8. A roll arrangement in accordance with any one of the preceding claims, characterized in that the respective support elements (22) at the nip side are resiliently loaded into their retracted position.
9. A roll arrangement in accordance with claim 8, characterized in that the respective support elements (22) at the nip side are each loaded into their retracted position by a conical spring (30).
10. A roll arrangement in accordance with claim 9, characterized in that the conical spring (30) has the shape of an at least substantially flat spiral in the loaded state.
11. A roll arrangement in accordance with claim 9 or claim 10, characterized in that the spring (30) loading a respective support element (22) at the nip side into the retracted position is arranged inside the support element (22) and is preferably supported at an abutment (32) which is arranged at one end of a bolt (34) or the like which extends into the support element (22) and which is fixed to the carrier (20) at its other end.
12. A roll arrangement in accordance with any one of the preceding claims, characterized in that the support elements (22) on the nip side are hydraulic support elements which are hydrodynamically and/or hydrostatically lubricated; and in that the oil temperature can be controlled such that it is higher during start-up operation than thereafter.
13. A roll arrangement in accordance with any one of the preceding claims, characterized in that the support elements (22) on the nip side are hydraulic support elements which are hydrodynamically and/or hydrostatically lubricated; and in that the volume flow of the oil is changeable in dependence on whether or not the deflection controlled roll (14) is in start-up operation.
14. A roll arrangement in accordance with any one of the preceding claims, characterized in that the support elements (22) at the nip side can be brought into contact with the roll jacket (18) by pressure loading.
15. A roll arrangement in accordance with any one of the preceding claims, characterized in that at least the support elements (22) adopting their retracted position are pressure free during start-up operation.
16. A roll arrangement in accordance with any one of the preceding claims, characterized in that it is designed as a multi-roll calender.

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